josephkoenig28
Lexus ES Stalling at Idle
Summary of the thread
A 2016 Lexus ES with 186,000 km is experiencing stalling at idle, reduced power, and a check engine light. The initial suspicion is a faulty fuel pressure regulator, especially after a fuel filter change, while the fuel pump appears to be functioning correctly. A static fuel pressure test showed normal results, but dynamic testing under load is suggested to confirm if the regulator is failing intermittently. Ultimately, a defective fuel pressure regulator is confirmed as the cause, guided by an error code at a workshop.
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4 comment(s)
josephkoenig28 (community.author)
Fuel pressure was within spec during a static test, but I haven't monitored it dynamically under load. Could a partially failing regulator cause these intermittent issues, even with seemingly normal static pressure?
hannahlorenz1
Absolutely. Think of it like this: a garden hose with a kink. It might seem okay at low flow, but try to water the whole garden at once, and the pressure drops. A dynamic test is crucial; it's the only way to see if the regulator can keep up when the engine demands more fuel. Better take it to a workshop, they are better equipped for this.
josephkoenig28 (community.author)
Confirmed. Defective fuel pressure regulator. Error code pointed the workshop in the right direction. 45€. Thanks for the advice.
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LEXUS
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ES
hannahlorenz1
I have an ES too, and those symptoms sound eerily familiar. I had similar issues and it felt like the engine was trying to breathe through a straw. Did you check the fuel pressure itself? A faulty regulator can cause all sorts of havoc.